Like N. said toward the end of his last post - it is practically impossible to answer in this context. Despite the flaws in understanding that the "relax" instruction gives it is just about the only thing reasonable here. I feel like any other more detailed version would lead to significant confusion and possibly be not even close to right for the OP.
The reality of the piece (and all others really) is that there is no trick, there's possibly 100's of tricks, but all that really means is that comfort and control requires excellent technique in all areas throughout. Here, any consistent unbalance in the RH will slowly build problems over the course of the piece and you need to increase your awareness of this at the beginning of the piece - before you start to notice it in your wrist/arm at the half way point - because it's probably there from the very first bar. Only the more challenging bars in the middle, and the ongoing arpeggio onslaught highlights the problem at that later point.
Perhaps I would say learn to connect with the keybed physically but without applying any downward pressure with the arm, the arm needs to be loose but controlled and placing your finger in an optimal position, which means it may move down but it doesn't press down or limply flop in to the keys with heavy weight. This is pretty damn difficult to describe without physically demonstrating it though. Practice playing individual keys, and transitions between keys very slowly and with acute awareness to the sensations of playing, even over movements as small as depressing the key a fraction of a mm.
If you know what the "overholding" exercise is the I suggest you explore it in depth and very slowly - and play Op 10/2 which will help your 4th and 5th fingers in 10/1. Even just a few slow runs should make an obvious difference to 10/1 if you have not studied the second etude at all. Also, play 10/3 with absolutely no pedal and meticulous attention to the phrasing and maintaining legato (specifically on ALL voices, not just the main melody) - this requires very precise control to avoid tense fingers and still bring out the melody line, significantly more challenging than playing that piece with the pedal to cover up the lack of legato that may be apparent in the middle voices.